Add support for reStructured Text markup language

Created by: Razer6

Support for reStructured Text only needs the python docutils package to be installed. This PR adds the installation instruction to the install guide and also to the update guide. Because GitLab uses the system python, installation via packet manager is least painful approach to support for docutils

With this PR all *.rst will be rendered as reStructuredText markup language. This implements feature request http://feedback.gitlab.com/forums/176466-general/suggestions/3868963-add-support-for-restructured-text

/cc @senny as discussed.

Created by: coveralls

Coverage decreased (-0%) when pulling b9717ba4 on Razer6:support_restructured_text into c5add8fe on gitlabhq:master.

By Administrator on 2013-07-30T17:36:30 (imported from GitLab project)

By Administrator on 2013-07-30T17:36:30 (imported from GitLab)

Created by: dplarson

By Administrator on 2013-08-02T08:23:21 (imported from GitLab project)

By Administrator on 2013-08-02T08:23:21 (imported from GitLab)

Created by: dzaporozhets

I've installed this package but still *.rst files are not rendered for me :(

By Administrator on 2013-08-03T08:44:24 (imported from GitLab project)

By Administrator on 2013-08-03T08:44:24 (imported from GitLab)

Created by: dzaporozhets

nevermind. Looks good.

By Administrator on 2013-08-03T08:45:48 (imported from GitLab project)

By Administrator on 2013-08-03T08:45:48 (imported from GitLab)

Created by: Razer6

Thank you for merge. Nevertheless it's a strange behavior? What system to you use? Does the test example from http://docutils.sourceforge.net/docs/dev/hacking.html#overview-of-the-docutils-architecture works? According to https://github.com/github/markup only docutils are needed-.

By Administrator on 2013-08-03T09:04:33 (imported from GitLab project)

By Administrator on 2013-08-03T09:04:33 (imported from GitLab)